www.tishmanspeyer.com/properties/200-park-avenue
www.panam.org/the-jet-age/370-air-rights-the-pan-am-building-2
https://en.wikiarquitectura.com/building/metlife-building/
www.thecityreview.com/panam.html
www.classicnewyorkhistory.com/history-of-new-yorks-metlife-building/
www.gothamist.com/news/in-1977-five-were-killed-in-helicopter-accident-atop-midtowns-pan-am-building
www.thisdayinaviation.com/16-may-1977/
https://en.wikipedia.org/wiki/MetLife_Building
https://en.wikipedia.org/wiki/New_York_Airways
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